Preparation method of high-strength and high-conductivity aluminum-magnesium-silicon-calcium alloy

Abstract

The invention relates to a preparation method of a high-strength and high-conductivity aluminum-magnesium-silicon-calcium alloy. Aiming at the disadvantages that an aluminum-magnesium-silicon alloy has low strength, poor conductivity and unstable mechanical properties, a calcium element is doped in the aluminum-magnesium-silicon alloy, and vacuum melting, argon gas bottom blowing protection and pouring and ingot formation are adopted to prepare an alloy with high-strength and high-conductivity characteristics through equal-channel corner extrusion and ageing treatment; a preparation technologyprovided by the invention has an advanced method and detailed and accurate data; the prepared alloy has the yield strength of 370MPa, the tensile strength of 370MPa, the elongation percentage of 12 percent and the electric conductivity of 57.2 percent IACS; compared with the prior art, the tensile strength is improved by 17.5 percent and the electric conductivity is improved by 8.9 percent; the mechanical properties and the conductivity of the aluminum-magnesium-silicon alloy are remarkably improved and an application range is expanded; the preparation method is an advanced preparation methodfor preparing the high-strength and high-conductivity aluminum-magnesium-silicon-calcium alloy.

Description

technical field [0001] The invention relates to a method for preparing a high-strength and high-conductivity aluminum-magnesium-silicon-calcium alloy, which belongs to the technical field of preparation and application of nonferrous metals for improving strength and enhancing conductivity. Background technique [0002] With the continuous expansion of power demand, there is an urgent need for light-weight, high-strength, high-conductivity, heat-resistant aluminum alloy conductor materials for overhead transmission lines. 6201 aluminum alloy is a commonly used aluminum alloy for overhead transmission wires. It belongs to high-strength aluminum alloy. The high-strength aluminum alloy wire LHA1 with a diameter ≥ 3.5mm has a tensile strength of 315MPa, an elongation of 3%, and an electrical conductivity of 52.5% IACS ( International Annealed Copper Standard). The problem with the 6201 aluminum alloy currently used in the industry is that its strength is slightly higher and its ...

AI Technical Summary

Problems solved by technology

The problem with the 6201 aluminum alloy currently used in the industry is that its strength is slightly higher and its conductivity is poor, which are contradictory and cannot meet the needs of long-distance transmission lines across large spans.

[0003] 6201 aluminum-magnesium-silicon alloy is prepared by alloying method, and Zr, B, RE, Sc and other elements are often added to increase the heat-resistant temperature of the alloy, and high-strength properties are obtained through large plastic deformation such as rolling and wire drawing combined with annealing treatment; CN 201610057588.3 The patent introduces "a high-strength and high-conductivity high-boron aluminum alloy wire and its preparation method". The conductivity of the aluminum alloy wire prepared by this method reaches 60.6-62.2% IACS, but the tensile strength is 288-298MPa, and the elongation The ratio is only 3.10-3.25%; CN 201611143869.7 patent introduces "a manufacturing method of high-conductivity and high-strength aluminum alloy wire for smart grid", the aluminum alloy prepared by this method has a tensile strength of 345MPa, but it consists of four It can only be achieved by twisting the wires, the strength of a single wire is only 170-200MPa, and the conductivity is only 54% IACS

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